A documentary film called “The Wolfpack” recently has received considerable attention, as has the family on whom it is based. The Angulo family of six brothers and a sister were raised by their parents in a four-room housing project apartment in the lower East Side of Manhattan. The children and their mother were kept locked in the apartment by the father, who believed he was protecting them from the corrupting influences of the outside world.

Reader question: We just backed out of our first real estate investment deal. We took some bad advice, but luckily, discovered an undisclosed issue through a whistleblower. It made us ask ourselves, what else could we have missed? What are the...